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희토류 자석 저감을 위한 영구자석 동기전동기 구조에 관한 연구
최윤철(Yunchul Choi),김태헌(Taehun Kim),방기창(Kichang Bang),김경원(Kyungwon Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper deals with the structure of permanent Magnet Synchronous Motor to reduce rare earth magnet. SPM, IPM and PMASynRM are compared and analyzed to propose the optimal performance structure by reducing the use of rare earth magnet. Each motor is designed by 2D finite element analysis. Based on this structure, it can be applied in various automotive motor.
영구자석 Stopper를 이용한 엑츄에이터 구조 개발에 관한 연구
김경원(Kyungwon Kim),최윤철(Yunchul Choi),손병욱(Byoungook Son),김호성(Hosung Kim),방기창(Kichang Bang) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper deals with the structure using magnet stopper of actuator valve which is applied BLDC motor to improve the power and effectiveness of vehicle engine. It’s not reqiured to flow the current when the valve stops. And also it has adventage to solve the problem of noise by using detent toque of magnet stopper. Based on this structure, it is designed to figure out the character of the actuator through 3D finite element analysis and to build the possibility of applying of the actuator applied permanent magnet stopper designed practical research process.
김경원(Kyungwon Kim),김태헌(Taehun Kim),권순효(Sunhyo Kwon),방기창,최윤철(Yunchul Choi) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Fuel cell electric vehicles are developed by a lot of automobile companies for reducing carbon dioxide that is main reason of global warming. In particular, the FCEV is a pollution-free car that does not emit exhaust gas by using hydrogen fuel and can largely alleviate problem of energy resource depletion and environmental pollution problems. Remaining hydrogen after burning reaction in the stack is recirculated to the entrance of the stack to prevent the waste of fuel and improve the efficiency of the system. In this system, a product recirculating hydrogen is the Hydrogen Recirculation Blower(HRB) motor. The vibration in HRB motor has a great effect on NVH performance of the FCEV because the motor is operated at high speed. The focus of this paper is to analyze dynamic characteristics through the vibration and frequency response analysis using MSC Nastran program. Also, real test is performed to verify simulation data.
SDN 응용 검증을 위한 프로세스 알지브라 기반 정형 기법
신명기(Myung-Ki Shin),이종화(Jong-Hwa Yi),최윤철(Yunchul Choi),이지현(Jihyun Lee),이승익(Seung-Ik Lee),강미영(Miyoung Kang),곽희환(Hee Hwan Kwak),최진영(Jin-Young Choi) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.6(네트워크)
최근 SDN (Software Defined Networking) 기반의 다양한 네트워크 제어 및 관리 플랫폼들이 서비스제공자 및 통신사업자들에 의해 연구되고 있다. SDN의 중요한 특징 중 하나는 소프트웨어 프로그램으로 작성된 간단한 응용에 의해 네트워크가 쉽게 제어되고 관리된다는 점에 있다. 이러한 관점에서 잘못 작성된 SDN 응용은 네트워크 전체에 오류를 발생시킬 수 있어, 해당 응용은 작성된 오픈플로우 포워딩 규칙(rule)을 SDN 컨트롤러(controller)를 통해 스위치에 반영하기 전에 토폴로지와 네트워크 환경의 안전성(safety)과 일관성(consistency)이 반드시 검증되어야 한다. 본 논문에서는 SDN 응용 검증을 위한 프로세스 알지브라 (process algebra) 기반의 언어인 pACSR (Packet based Algebra of Communicating Shared Resources)와 이를 기반으로 한 정형 검증 프레임워크를 제안하고, 이에 대한 SDN 정형검증 도구 연구시제품 구현 현황을 기술한다. Recently, there have been continuous efforts and progresses regarding the research on diverse network control and management platforms for SDN (Software Defined Networking). SDN is defined as a new technology to enable service providers/network operators easily to control and manage their networks by writing a simple application program. In SDN, incomplete or malicious programmable entities could cause break-down of underlying networks shared by heterogeneous devices and stake-holders. In this sense, any misunderstanding or diverse interpretations should be completely avoided. This paper proposes a new framework for SDN application verification and a prototype based on the formal method, especially with process algebra called pACSR which is an extended version of Algebra of Communicating Shared Resources (ACSR).